Cessna 150 student pilot reported an engine malfunction while on a solo training flight practicing maneuvers. The student turned to a nearby non-towered airport and landed safely.

Narrative

Around XA:00 I was at 4;000 ft MSL practicing maneuvers for a checkride. I had carb heat on and all engine gauges were in the green. Suddenly the engine started to shake violently and I had a major reduction in power. I seemed to be limited to 1700 RPM until the shaking increased considerably. I was 3 miles north of ZZZ Airport and turned to it immediately and began circling overhead to prepare for a landing. I ran through my checklists and things that I thought might explain a rough running engine. Things such as checking if the primer was in and locked; which it was. Checking oil pressure and temperature; these gauges indicated in the green; telling me that the engine hadn't lost all oil. Verifying fuel gauges indicated there was fuel. I don't trust these gauges; I filled up both tanks fully before I took off and had flown for about an hour and a half. The plane hold 26 gallons with 23 usable. When I landed I checked the fuel and had 17 gallons left. As I was circling over the airport; I checked everything I had control over in the plane. I found that there was nothing I could do to save the engine in flight. I then advised the ZZZ frequency (XXX.X). I lost enough altitude to enter a left downwind for runway XX. I made a tight pattern to stay higher and faster until I was established on final. I then put the aircraft into a slip to lose that last bit of altitude and speed. I then made a smooth touchdown on runway XX. Because I had some power; I was able to exit the runway and taxi near parking; while keeping it off the grass in case of a fire.